Skiers in Sweden were treated to a spectacular sight when mysterious UFO-shaped clouds hovered over ski resorts Åre and Duved on Thursday, reports The Local.
The enormous, cylindrical clouds resemble UFOs, but they are actually lenticular clouds. They form when air is forced to rise when it comes in contact with a natural or man-made objects like mountains or skyscrapers. When the air cools, it forms amazing shapes.
Instagram users uploaded breathtaking photos of the cloud:
This video explains how the clouds are formed: